Sulfurous Acid

Base Information Edit

Chemical Name:Sulfurous Acid
CAS No.:7782-99-2
Deprecated CAS:104927-19-7,110883-84-6,111910-53-3,125289-32-9,152463-65-5,21093-41-4,63921-72-2,65003-85-2,66085-60-7,68720-49-0,70074-94-1,75481-08-2,80879-60-3,1087413-38-4,2650417-68-6,1087413-38-4,110883-84-6,111910-53-3,152463-65-5,21093-41-4,63921-72-2,65003-85-2,66085-60-7,68720-49-0,70074-94-1,75481-08-2,80879-60-3
Molecular Formula:H2O3S
Molecular Weight:82.0801
Hs Code.:28111990
European Community (EC) Number:231-973-1
UN Number:1833
UNII:J1P7893F4J
DSSTox Substance ID:DTXSID7042435
Nikkaji Number:J54.364K
Wikipedia:Sulfurous acid
Wikidata:Q206778
NCI Thesaurus Code:C76122
ChEMBL ID:CHEMBL1161699
Mol file:7782-99-2.mol

Synonyms:Sulfurous acid;7782-99-2;Sulphurous acid;Schweflige saure;H2SO3;EINECS 231-973-1;acide sulfureux;acido sulfuroso;CHEBI:48854;schweflige Saeure;Schweflige saure [German];trioxosulfuric acid;dihydroxidooxidosulfur;UNII-J1P7893F4J;J1P7893F4J;SULPHUROSUM ACIDUM;UN1833;DTXSID7042435;S(O)(OH)2;SULFUROUS ACID (II);SULFUROUS ACID [II];(SO(OH)2);[SO(OH)2];Trioxosulphate(IV);Sulfur dioxide soln;Trioxosulphate(2-);Sulfurous acid (DOT;dihydrogen trioxosulfate;H2O3S;SULFUROUS ACID [MI];CHEMBL1161699;DTXCID5022435;SULFUROUS ACID (H2SO3);H2-O3-S;SULPHUROSUM ACIDUM [HPUS];BDBM50147623;MFCD00011335;NA1833;Sulfurous acid [UN1833] [Corrosive];Sulfurous acid [UN1833] [Corrosive];Sulfurous acid, SO2 (6.0%) in water;LS-148245;FT-0693956;C00094;Q206778

Suppliers and Price of Sulfurous Acid

Supply Marketing:Edit

Business phase:: The product has achieved commercial mass production^*data from LookChem market partment

Manufacturers and distributors:

Manufacture/Brand
Chemicals and raw materials
Packaging
price

Sigma-Aldrich
Sulfur dioxide solution ACS reagent, ≥6%
100g
$ 66.10

Sigma-Aldrich
Sulfur dioxide solution ACS reagent, ≥6%
2kg
$ 215.00

Sigma-Aldrich
Sulfur dioxide solution ACS reagent, ≥6%
500g
$ 118.00

GFS CHEMICALS
SULFUROUSACID,6%,REAG.
2.5 L
$ 80.49

GFS CHEMICALS
SULFUROUSACID,6%,REAG.
4 X 2.5 L
$ 241.42

Alfa Aesar
Sulfurous acid, ACS 6.0% SO2 min
*4x500ml
$ 267.00

Alfa Aesar
Sulfurous acid, ACS 6.0% SO2 min
500ml
$ 71.40

Total 29 raw suppliers

Chemical Property of Sulfurous Acid Edit

Chemical Property:

Appearance/Colour:clear, colorless liquid
Refractive Index:1.788
PKA:1.92(at 25℃)
PSA：76.74000
Density:2.483 g/cm³
LogP:0.54680
Sensitive.:Air Sensitive
Water Solubility.:Miscible with water.
XLogP3:-0.5
Hydrogen Bond Donor Count:2
Hydrogen Bond Acceptor Count:4
Rotatable Bond Count:0
Exact Mass:81.97246510
Heavy Atom Count:4
Complexity:26.3
Transport DOT Label:Corrosive

Purity/Quality:

98%min ^*data from raw suppliers

Sulfur dioxide solution ACS reagent, ≥6% ^*data from reagent suppliers

Safty Information:

Pictogram(s): C
Hazard Codes:C,Xn
Statements: 20-34-36/38
Safety Statements: 26-36/37/39-45

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

Chemical Classes:Toxic Gases & Vapors -> Acids, Inorganic
Canonical SMILES:OS(=O)O
Description Sulfurous Acid is a weak and unstable inorganic acid, which is considered an aqueous solution of sulfur dioxide in water. It is formed theoretically by burning sulfur to produce sulfur dioxide, which is then reacted with water. However, there is no evidence that sulfurous acid exists in solution, while the molecules of which has been detected in the gas phase, since the reaction is reversible and the acid readily decomposes back into the reactants. Sulfurous acid is not usually available in its acid form, but more commonly prepared as its sodium or potassium salts. Sulfurous acid and its salts are commonly applied as powerful reducing agents and disinfectant agents due to its strong reducibility. It is also considered as a mild bleaching agent especially for applications having chlorine sensitive materials. Besides, Sulfurous acid is a food additive listed on the EAFUS food Additive Database (Jan. 2001).
Uses As a bleaching agent, sulfurous acid is used for whitening wool, silk, feathers, sponge, straw, wood, and other natural products. In some areas, its use is permitted for bleaching and preserving dried fruits. The salts of sulfurous acid are sulfites. Sulfurous acid (H2SO3) can be produced by burning sulfur to form sulfur dioxide (SO2) gas and by then dissolving the gas in water to form sulfurous acid. This is the acid produced by burning coal that has a high sulfur content; the gaseous sulfur dioxide by-product of combustion then combines with atmospheric water to form “acid rain.” Dental bleach.

Technology Process of Sulfurous Acid

There total 135 articles about Sulfurous Acid which guide to synthetic route it. The literature collected by LookChem mainly comes from the sharing of users and the free literature resources found by Internet computing technology. We keep the original model of the professional version of literature to make it easier and faster for users to retrieve and use. At the same time, we analyze and calculate the most feasible synthesis route with the highest yield for your reference as below:

synthetic route:

Reference yield: 82.0%